One of friends alerted me to your discussion of 'parallel' and whether
other tools can replace it. Here are some good examples to try to
reproduce without 'parallel':
$ ls | grep abc | parallel gzip -c >/tmp/file.gz
Try this in a dir with 1000 50 kB sized mixed files with file names
that include these characters: [-'` "+*<>&$!?|]. The output is a valid
.gz file as the output is grouped. In other solutions not using
parallel you will often have a race condition (such as running two
cat's in parallel).
$ ls | parallel diff {} foo ">"{}.diff
$ ls | parallel 'echo -n {}" "; ls {}|wc -l'
These should also be run on files with names containing interesting
characters [-'` "+*<>&$!?|].
$ seq 1 255 | parallel -j 50 'ping -c 1 10.0.0.{} && wget
http://status-server/status.cgi?ip=10.0.0.{}'
The 3 above would normally require making a script and calling it. I
have yet to see how to do that on the command line (including the
parallelization).
$ cat shellscript
ls foo
touch bar
host foo.bar
ping bar.foo
seq 1 10 | ssh foo.bar "cat >/tmp/count"
wget http://foo.bar/info
[...1000000 other one line shell commands...]
$ cat shellscript | time sh
$ cat shellscript | time parallel
This one of the ways I use 'parallel' most with the shellscript often
being generated.
There are more examples in the man-page.
<Disclosure>
I am the author of 'parallel'
</Disclosure>
/Ole
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